WebUI: Undo some usages of ES6 features that break uglify.

chrome/browser/resources/settings/site_settings/cookie_info.js

Index: chrome/browser/resources/settings/site_settings/cookie_info.js
diff --git a/chrome/browser/resources/settings/site_settings/cookie_info.js b/chrome/browser/resources/settings/site_settings/cookie_info.js
index dae2096f447e51c438823e7222dcce2cdf597f75..d58eb6e5dfd8b2d21677e51212267a0cb46648b4 100644
--- a/chrome/browser/resources/settings/site_settings/cookie_info.js
+++ b/chrome/browser/resources/settings/site_settings/cookie_info.js
@@ -75,7 +75,8 @@ var getCookieData = function(data) {
   /** @type {!Array<CookieDataForDisplay>} */
   var out = [];
   var fields = cookieInfo[data.type];
-  for (var field of fields) {
+  for (var i = 0; i < fields.length; i++) {
+    var field = fields[0];
     // Iterate through the keys found in |cookieInfo| for the given |type|
     // and see if those keys are present in the data. If so, display them
     // (in the order determined by |cookieInfo|).